hehehehe good one!
On May 22, 2009, at 3:21:19 PM, "BOB KISS" <firstname.lastname@example.org> wrote:
No silly, the Caseins were rolling along (as in “Over hill, over dale, all along the dusty trail…)!
From: ender100 [mailto:email@example.com]
Sent: Friday, May 22, 2009 3:34 PM
Subject: Re: Casein
Was the casein from free-range cows? hehehehe
On May 22, 2009, at 2:06:42 PM, "Loris Medici" <firstname.lastname@example.org> wrote:
I did my first casein trial yesterday evening, w/o any success. See below:
- 0.8g casein (Kremer's)
- 5ml tap water
- waited 10 minutes (to let casein absorb water - I'm not sure if that's
necessary but did so anyway, I was not in a hurry...)
- added 8 drops of 25% (910) ammonia (it seems to be a lot, will try
halving the amnt. next time)
- I mixed the slurry (cream consistency) until it looks homogeneous
- I added 5ml of 5% ammonium dichromate (it turned to yellow - because of
excess alkalinity I presume...)
- I mixed the solution (not a slurry anymore, pretty homogeneous looking
solution slightly less viscous than my usual gum coating mix)
- made up a coating solution by adding the dichromated casein solution to
a very small amnt. of W &N acrylic color (burnt umber)
- coated the paper, dried with a hair dryer, humidified the paper with an
ultrasonic humidifier, exposed for 2 mins. under a bank of UVBL tubes (I
didn't get a dichromate image after exposure)
- developed(!) face down for 20minutes
I got absolutely no development, no pigment coming off, no dissolution of
binder at all.
What could be the cause?
Overexposure? Using acrylics? (But I know someone - Guido Ceuppens - who
uses acrylic colors with casein...) Both? Any other thoughts?
Will try with only 30secs exposure tonight...
Regards & thanks in advance,
__________ Information from ESET NOD32 Antivirus, version of virus signature database 4098 (20090522) __________
The message was checked by ESET NOD32 Antivirus.